I totally understand! I dont have anyone to help me either. Im small, and dont weigh much, and also have a illness that makes it almost impossible to do some stuff too.
My pump( joe blow sprint) was 69 aus.I know its alot.I had to get it after having crap pumps, one after another, they broke or leak or dont work.
It took me ( and I had some help) to change the tire, a whole HOUR.
I cant get the tube on the rim!
But bought the pump. Lost air quite a few times and had major embarrassment when I called the shop to say, it wont work!( Turns out I had turned the clip that secures the nozzle, to presta( if thats the one that doesnt have the screw on valve, like cars. I have the screw on valve ones).
Sometimes its almost impossible to get air in those tires, without needing a rest! I do need pushups, if I could only get over shoulder problems!
Im so paranoid about flats, that every time I go thru glass, I stop and pick the bits off the tire( no blow outs yet but one! In a year).
My tires are pumped to 120( 0n a strong day) and they leak air also.
The pump is great though. I have a small one for gas, but had to practice a bit. Its just too hard on road to use small pump( and its a good one with gauge and flip out stand bit and unfolding handle). So I have a inexpensive pump( that fits in backpack) for gas and little pump for flats, in case I screw up the gas(!) and use Joe Blow at home.
I hope it gets easier. I lose air from tires, about every three times.Your not alone, and I feel for you!